elasticsearch中Long型总是自动减10？？？

更新：
POST action_log_2016/action_log_2016/201601070000000010/_update
{
"doc": {
"IDX": 201601070000000010,
"actiondetail": "for tXXXXXXXesting"
},
"doc_as_upsert": true
}

结果：
"hits": {
"total": 1,
"max_score": 1,
"hits": [
{
"_index": "action_log_2016_v3",
"_type": "action_log_2016",
"_id": "201601070000000010",
"_score": 1,
"_source": {
"IDX": 201601070000000000,
"actiondetail": "for tXXXXXXXesting"
}
}
]
}
 
注意IDX的值自动减10，why？